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In Reply to: OTL Amp in Ebay posted by ojd on April 14, 2006 at 09:33:11:
I've seen mention (via google) of 6AS7-based Chinese made OTL amps, being sold on eBay without warranties. This may be an example.The amps shown in the link do have a Chinese-y look to them, but they could just as easily be European (Russian would be a guess).
Think I'll email the seller for the spec sheets, and see what I get back. That's a quite a box of parts for $500.. doubt it could have been made in the west at those rates.
Follow Ups:
My thougths exactly, a lot of parts for the money. But as afar as I know the chinese don't make a 6AS7G (do they?) so it probably is russian/ eastern european.
We've been testing a batch just in the last week. They seem every bit as good as the Sovtek so far.
I sent an email to the seller, and received a reply from a Mr. Craig Merz, Silver City NM, USA. Interestingly enough, he said that the amps are built there, in Silver City NM - from this, one would infer that he is the builder, but he did not explicitly say this.
Here is a quick rundown of design features, from his instruction sheet (forwarded in MS Word DOC format):
- Totem pole output, similar to early Futterman
- Rated 75W/4ohms 100W/8ohms
- Power consumption 525W idle, 1400W full output
- 1.75VAC signal input for full output (500K Zin)
- Output tube complement 20X 6AS7/6080 (10X/channel)
- Driver tube complement 2X 12SN7 (6SN7 option), 2X 12AT7
- Seperate 625VA B+ xfmr for each channel
- Series string for output tube heaters (direct to AC line)
- DC switching supply for driver tube heaters
- 10 individual fuses for circuit and speaker protection
The model is simply designated "OTL 20" and seems to have no further branding.
Personaly, I don't like the series string heaters. I understand the logic, a filliment transformer would have to produce over 50A so I guess series may have to be the way to go.
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